A single-ply roof with a dark ring around a seam, or a patch that lifted within one summer, is usually reporting on preparation and movement more than on the sheet itself. Versico makes single-ply membrane systems in the TPO, PVC and EPDM families, together with the adhesives, tapes and flashing accessories that go with them, so the first job on a Versico roof in Henderson, NV is to work out which of those families is overhead and how it was attached.
Summer afternoons in the Mojave Desert regularly pass 110°F, according to Henderson's emergency guidance, and that heat moves a membrane every day. We trace the symptom to a likely cause, collect moisture evidence, and set a repair boundary before anyone talks about replacement.
Identify the Membrane and Its Attachment First
A white sheet is not necessarily TPO, and a black one is not necessarily EPDM. We confirm the family by checking seam construction, taking a small sample where the owner approves it, and reading any labels on the deck or in the roof file. Welded seams point to a thermoplastic sheet, while taped or glued seams point to EPDM.
Attachment matters as much as chemistry. A fully adhered system, a mechanically attached one and a ballasted one fail in different ways, so the repair method follows the assembly we document on the first visit. A building re-roofed in stages may carry a Versico sheet beside a roof from Carlisle SynTec or Sika Sarnafil, and each needs its own repair method. Insulation type and thickness, the cover board if one is present, and the deck beneath all go into that record, since they decide whether a fastener can be reset or must be replaced.
Probe Seams Where Heat Moves the Sheet
Thermal movement works hardest at laps, fastener rows and wall terminations. On a thermoplastic sheet we probe the weld edge along its full length, and we look for pinholes, uneven overlap and open channels. On EPDM we check tape and adhesive laps for creep, shrinkage and contamination.
A TPO roof that has weathered in the sun may need a cleaner before a hot-air weld will fuse, so the patch method is chosen after a test weld, not before it.
Inspect Curbs and Penetrations as the First Suspects
Most leaks on single-ply roofs begin at something cut through the field. Equipment curbs, pipe boots, drains and edge metal each carry their own flashing, and each has its own failure mode: a split corner, a boot that has hardened, a termination bar that has loosened. We photograph every one and record the condition by roof zone.
Henderson's plan reserves employment-center land in the Sunset Industrial Corridor for light industrial, warehousing and flex space, and buildings of that type tend to carry rooftop units on equipment curbs and supports. Each curb that has been reflashed or raised since the original install deserves a second look, because a detail added later is the one most likely to have been built over a dirty or aged sheet.
Trace Monsoon Water Paths Before Choosing Work
Monsoon-season storms between July and September can dump intense, localized rain that overwhelms drainage, as city flood-control guidance notes. The 1991-2020 NOAA normals for the Las Vegas station show only 4.18 inches of precipitation in a year, so a roof sees little water for months and then a great deal in an hour.
We follow the water from the low point to the outlet. Standing water over sound insulation is a drainage question, while water at a failed lap is a seam question. Persistent ponding water and a blocked scupper call for different fixes, and a coating or patch applied to the wrong one fails again. After a monsoon storm we check for debris at the outlets, sediment carried onto the surface and any seam that opened under the weight of standing water.
Match Repair, Recover or Replacement to the Evidence
A localized repair fits when the moisture survey shows dry insulation and the membrane is sound outside the defect. A recover over a single-ply roof is possible only when the existing insulation is dry and the deck can carry the added layer. Wet insulation, widespread seam failure or a soft deck moves the decision to replacement.
Permit submittals received on or after January 2, 2026 follow Henderson's adopted 2024 International Building Code and Energy Conservation Code, so the scope also has to state the insulation and attachment the new assembly will use. A scope that leaves those items open invites change orders after tear-off, which is why we settle them in writing from the moisture evidence.
Keep a Record That Outlasts the Crew
A written inspection record names each roof zone, lists the defects found, and shows what was repaired. When a manufacturer warranty exists, the record also shows what the owner has done to keep it in force, which helps a property manager sort out warranty paperwork when a claim is considered.
Water Street is planned as a mixed-use district of retail, professional services and employment, while the Global Business District in West Henderson is an employment center. On buildings with active tenants, the record also lists the access route, the working hours and the roof zone closed each day, so the next visit starts from the same plan.
Have a Versico Roof Evaluated
Share the roof plans, warranty papers, leak dates, recent repairs and operating hours. We will inspect the membrane and document repair or replacement options.
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